BUG/MEDIUM: compat: fix segfault on FreeBSD

BUG/MEDIUM: compat: fix segfault on FreeBSD

Since commit 65d805fd witch removes standard.h from compat.h some
values were not properly set on FreeBSD. This caused a segfault
at startup when smp_resolve_args is called.

As FreeBSD have IP_BINDANY, CONFIG_HAP_TRANSPARENT is define. This
cause struct conn_src to be extended with some fields. The size of
this structure was incorrect. Including netinet/in.h fix this issue.

While diving in code preprocessing, I found that limits.h was require
to properly set MAX_HOSTNAME_LEN, ULONG_MAX, USHRT_MAX and others
system limits on FreeBSD.